NASA received radio signals from Comet 67P for 20 years before the European Space Agency sent the Rosetta space probe on its incredible mission that landed a human-built spacecraft on the surface of the comet — the first space landing on a comet in human history — a source claiming to be an ESA insider says.

Earlier in November, the ESA actually announced that it was, in fact, picking up mysterious signals from the comet, calling the signals “a mysterious ‘song’ that Comet 67P/Churyumov-Gerasimenko is singing into space,” calling to mind the musical form of communication use by the fictional aliens in the classic Stephen Spieleberg sci-fi filmClose Encounters Of The Third Kind.

“The comet seems to be emitting a ‘song’ in the form of oscillations in the magnetic field in the comet’s environment,” the ESA said in a November 11 online post. “It is being sung at 40-50 millihertz, far below human hearing. To make the music audible to the human ear, the frequencies have been increased in this recording…”

But according to the anonymous email source, NASA and the ESA are aware that Comet 67P is not a comet at all, but an extremely sophisticated — and massive — UFO.

The email does not claim specifically that the comet is an alien spacecraft, but rather, “something completely different from a comet and is only being disguised as such. As for who is disguising it and why, I cannot answer,” the anonymous source wrote.

The unnamed emailer implores the recipients of the email to “not think for ONE MOMENT that a space agency would suddenly decide to spend billions of dollars to build and send a spacecraft on a 12 year journey to simply take some close-up images of a randomly picked-out comet floating through space.”

Since the Rosetta probe lander Philae touched down on the surface of Comet 67P on November 12, UFO watchers have examined photos sent back from the spacecraft and found what they say are anomalous structures, or even buildings, on the surface of the comet.

One of those white structures is indicated in the photo above.

And this week, Joe White of the YouTube channel Art Alien TV posted a video purporting to show an artificial structure on the surface of the comet.

Watch the video below, and listen to the comet’s “song,” above, and decide for yourself — are NASA and the ESA covering up the truth that Comet 67P is actually a UFO? Or is there a rational explanation for these strange phenomena?